Blind randomised non-crossover long-term trial comparing topical timolol 0.25% with timolol 0.5% in the treatment of simple chronic glaucoma.

The results of a 12-month blind randomised trial comparing the intraocular pressure lowering effect of timolol 0.25% with timolol 0.5% are presented. 27% of patients (22% of eyes) required additional antiglaucoma medication after a minimum time interval of 6 months to maintain an intraocular pressure less than 23 mmHg. The mean reduction in intraocular pressure (from pretreatment values) at 12 months was 24% for eyes treated with timolol 0.25% and 19% for eyes treated with timolol 0.5%. When reductions in intraocular pressure at each follow-up interval were statistically significant (timolol 0.25% treated eyes compared with timolol 0.5% treated eyes), the significance always favoured timolol 0.25%.